CVE-2026-25542: Linuxfoundation Tekton Pipelines

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 0.43.0 and prior to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1, trusted resources verification policies match a resource source string (refSource.URI) against spec.resources[].pattern using regexp.MatchString. In Go, regexp.MatchString reports a match if the pattern matches anywhere in the string, so common unanchored patterns (including examples in tekton documentation) can be bypassed by attacker-controlled source strings that contain the trusted pattern as a substring. This can cause an unintended policy match and change which verification mode/keys apply. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.

Affected products

• Linuxfoundation Tekton Pipelines: from 0.43.0, before 1.11.0 (fixed in 1.11.0)

Published 2026-04-21. Last modified 2026-06-17.